Big Ideas |
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To collect good first-hand data, you must decide what method is most suitable and how to best pose any questions required to collect the data |
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To collect good second-hand data, you must be very clear on what you want to know and what source can be trusted to supply that data |
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Sometimes a large set of data can be accurately described using the mean, median, mode, and range |
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Pictographs and bar graphs (and histograms and stem-and-leaf plots) are used for comparing the frequency of data in different categories |
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Line graphs (and scatter plots) are particularly useful for showing relationships between two quantities and trends. |
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How data is graphed can affect what conclusions are drawn from the data |
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